10550331221 has 2 divisors, whose sum is σ = 10550331222. Its totient is φ = 10550331220.

The previous prime is 10550331199. The next prime is 10550331241. The reversal of 10550331221 is 12213305501.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6870088996 + 3680242225 = 82886^2 + 60665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10550331221 is a prime.

It is a super-2 number, since 2×10550331221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10550331241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275165610 + 5275165611.

It is an arithmetic number, because the mean of its divisors is an integer number (5275165611).

Almost surely, 2^10550331221 is an apocalyptic number.

It is an amenable number.

10550331221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10550331221 is an equidigital number, since it uses as much as digits as its factorization.

10550331221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 10550331221 its reverse (12213305501), we get a palindrome (22763636722).

The spelling of 10550331221 in words is "ten billion, five hundred fifty million, three hundred thirty-one thousand, two hundred twenty-one".